I am having problems setting up GRUB to boot windows, I have installed windows xp on hd1 and fedora 4 on hd0. GRUB is installed on the MBR ( as far as I know )

Here is the grub.conf:

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora Core (2.6.11-1.1369_FC4)
root (hd0,0)
kernel /vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.11-1.1369_FC4.img
title Windows
rootnoverify (hd1,0)
chainloader +1

When I select windows, it outputs:

rootnoverify(hd1,0)
chainloader +1

What am I doing wrong?

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu

title Fedora Core (2.6.11-1.1369_FC4)
root (hd0,0)
kernel /vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.11-1.1369_FC4.img

title Windows
rootnoverify (hd1,0)
makeactive
chainloader +1

try the makeactive, thats what grub requires w/ my gentoo install
also hitting e on the windows selection will allow you to mess around with it before its executed

Same output, except with the makefile line added.

fdisk -l output:

Disk /dev/hda: 40.0 GB, 40027029504 bytes
255 heads, 63 sectors/track, 4866 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 3277 26218080 83 Linux
/dev/hda3 3278 3799 4192965 83 Linux
/dev/hda4 3800 4866 8570677+ 5 Extended
/dev/hda5 3800 3930 1052226 82 Linux swap / Solaris

Disk /dev/hdb: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hdb1 * 1 14593 117218241 7 HPFS/NTFS

go to the grub commandline (i believe its c) and enter in partitions till you find one that looks like windows

for example
grub > root (hd1,0) #this will spit out what grub thinks the partition has

once you find the partition that looks good you can proceed to use it

grub > makeactive
grub > chainloader +1
grub > boot

the other problem that could have ocurred is that you installed grub into both master boot records, in that case when you define the second hard drives sole partition it just hits grub

if that is the case you may want to try switching the hard drives in the bios, and switching the hard disks in grub